If the sum of first 15 terms of an A.P. is 225 and the sum of first 21 terms of an A.P. is 441 find the sum to first n terms and also find the A.P.
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Hey mate plzzz mark as brainlist answer......
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sum of n term = n²
A.P are 1 . 3 . 5 . 7.......
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